Advanced Materials

Design with two doors and two bogies, on rails, allows for rapid bogie changes

Bogie hearth furnaces equipped with SiC rod heating can be used in the production of technical ceramics, especially for sintering at working temperatures up to 1550 °C. The WHTC product line with especially robust design can hold heavy charges including kiln furniture. The furnace chamber is equipped with a high-quality insulation made of high-temperature fiber blocks. The bogie insulation is structured in multi-layer lightweight refractory bricks on the heating chamber side.

The furnace is heated along both sides by vertically installed SiC heating rods. This heating technology permits processes requiring working temperatures above 1350 °C which cannot achieved with wire heating elements. The SiC rods are controlled by thyristor controller which counteract the aging of the heating elements by means of automatic power compensation.

High-Temperature Furnaces with SiC Rod Heating up to 1550 °C

Vertically mounted SiC rods and optional perforated air inlet tubes of the debinding system

Exhaust-air flap and charge thermocouple including a stand as additional equipment

HTC 16/16 - HTC 450/16

The high-temperature furnaces HTC 16/16 - HTC 450/16 are heated by vertically hung SiC rods, which makes them especially suitable for sintering processes up to a maximum operating temperature of 1550 °C. For some processes, e.g. for sintering zirconium oxide, the absence of interactivity between the charge and the SiC rods, these models are more suitable than the alternatives heated with molybdenum disilicide elements. The basic construction of these furnaces make them comparable with the already familiar models in the HT product line and they can be upgraded with the same additional equipment.

Tmax 1550 °C

Dual shell housing with fan cooling for low shell temperatures

Heating from both sides via vertically mounted SiC rods

High-quality fiber insulation backed by special insulation

Side insulation constructed with tongue and groove blocks provides for low heat loss to the outside

Long-life roof insulation with special suspension

Chain-guided parallel swivel door for defined opening and closing of the door without destroying the insulation

The high-temperature furnaces HT 04/16 - HT 450/18 have proven reliability over many years in the lab and in the production of technical ceramics. Whether for bioceramics, for sintering CIM components or for other processes up to a maximum temperature of 1800 °C, these furnaces afford the optimal solution for the sintering process.

High-temperature furnaces can either be insulated with fiber material or lightweight refractory bricks. Furnaces with fiber insulation achieve significantly shorter heating up times because of the low thermal mass. An insulation made of lightweight refractory bricks (see HFL models on page 49), on the other hand, has the advantage of better chemical stability.

These furnaces can also be tailored to specific processes by means of a wide range of additional equipment. The addition of a debinding package, for example, allows the use of these models as combi furnaces for debinding and sintering in one process. Thermal or catalytic exhaust cleaning equipment rounds-off the system.

Tmax 1600 °C, 1750 °C or 1800 °C

Recommended working temperature 1750 °C (for models HT ../18), increased wear and tear must be expected in case of working at higher temperatures

Dual shell housing with fan cooling for low shell temperatures

Heating from both sides via molybdenum disilicide heating elements

High-quality fiber insulation backed by special insulation

Side insulation constructed with tongue and groove blocks provides for low heat loss to the outside

Long-life roof insulation with special suspension

Chain-guided parallel swivel door for defined opening and closing of the door

Additional equipment

Uncontrolled or controlled cooling system with frequency-controlled cooling fan and motor-driven exhaust air flap

Furnace in DB design featuring fresh air preheating, exhaust gas ventilation and an extensive safety package for debinding and sintering in one process, i. e. without transfering the material from the debinding furnace to the sintering furnace

Stainless steel exhaust gas hoods

Commissioning of the furnace with test firing and temperature uniformity measurement (also with load) for the purpose of process optimization

Temperature measurement with thermocouples, types B and type S with automatic pull-out device for precise control results in the low temperature range

Protection grid in front of the heating elements to prevent mechanical damages

Special heating elements for zirconia sintering provide for longer service life with respect to chemical interaction between charge and heating elements

Protective gas connection for purging the furnace with non-flammable protective or reaction gases

Manual or automatic gas supply system

Inner process box to improve the gas tightness and to protect the furnace chamber against contamination

High Temperature Furnaces with Molybdenum Disilicide Heating Elements with Refractory Insulation up to 1700 °C

The high-temperature furnaces HFL 16/16 - HFL 160/17 are characterized by its lining with robust refractory insulation. Compared with the fiber-insulated models of the HT product line, these furnaces are recommended when high charge weights have to be sintered. In most cases lightweight refractory brick insulation is also significantly more resistant to gas emissions occurring during heat treatment.

For charging complex settings we recommend lift-top or lift-bottom furnaces. Also small workparts can be conveniently loaded on different layers.

The basic furnace comes with one table. Depending on the technical requirements are equipped, a lift-top or lift-bottom version will be the choice. The system can be expanded with one or more changeable tables, either manually or electrically driven. Other additional equipment, like controlled cooling systems to short process cycles or the addition of a debinding package for debinding and sintering in one process provide for tailored solution for individual needs.

Additional equipment

Uncontrolled or controlled cooling system with frequency-controlled cooling fan and motor-driven exhaust air flap

Furnace in DB design featuring fresh air preheating, exhaust gas ventilation and an extensive safety package for debinding and sintering in one process, i. e. without transfering the material from the debinding furnace to the sintering furnace

Stainless steel exhaust gas hoods

Commissioning of the furnace with test firing and temperature uniformity measurement (also with load) for the purpose of process optimization

Temperature measurement with thermocouples, types B and type S with automatic pull-out device for precise control results in the low temperature range

Special heating elements for zirconia sintering provide for longer service life with respect to chemical interaction between charge and heating elements

Heat from all sides and between the stack or with heating elements, positioned above each other to optimize temperature uniformity

Protective gas connection for purging the furnace with non-flammable protective or reaction gases

Manual or automatic gas supply systems

Inner process box to improve the gas tightness and to protect the furnace chamber against contamination

Gas supply system in the furnace chamber with ceramic bell jar, protective gas inlet and outlet from below for better sealing when operating with protective gases and/or to prevent from chemical interactions between the load and the insulation or the heating elements

Alternative table changing systems

Safety concepts

Exhaust air and exhaust gas piping

Thermal or catalytic exhaust cleaning systems

FID measurement for process optimization

Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control

Model

Tmax

Inner dimensions in mm

Volume

Outer dimensions in mm

Heating power in

Electrical

Weight

°C

w

d

h

in l

W

D

H

kW1

connection*

in kg

HT 64/16 LB, LT

1600

400

400

400

64

1100

1750

2400

36

3-phase

1100

HT 166/16 LB, LT

1600

550

550

550

166

1350

2060

2600

42

3-phase

1500

HT 276/16 LB, LT

1600

1000

500

550

276

1800

2100

2600

45

3-phase

1850

HT 400/16 LB, LT

1600

1200

600

550

400

1900

2200

2680

69

3-phase

2600

HT 500/16 LB, LT

1600

1550

600

550

500

2100

2200

2680

69

3-phase

2700

HT 1000/16 LB, LT

1600

1000

1000

1000

1000

1800

2900

3450

140

3-phase

3000

HT 1030/16 LB, LT

1600

2200

600

780

1030

2950

2500

3050

160

3-phase

3200

HT 64/17 LB, LT

1750

400

400

400

64

1100

1750

2400

36

3-phase

1100

HT 166/17 LB, LT

1750

550

550

550

166

1350

2060

2600

42

3-phase

1500

HT 276/17 LB, LT

1750

1000

500

550

276

1800

2100

2600

45

3-phase

1850

HT 400/17 LB, LT

1750

1200

600

550

400

1900

2200

2680

69

3-phase

2600

HT 500/17 LB, LT

1750

1550

600

550

500

2100

2200

2680

69

3-phase

2700

HT 1000/17 LB, LT

1750

1000

1000

1000

1000

1800

2900

3450

140

3-phase

3000

HT 1030/17 LB, LT

1750

2200

600

780

1030

2950

2500

3050

160

3-phase

3200

HT 64/18 LB, LT

1800

400

400

400

64

1100

1750

2400

36

3-phase

1100

HT 166/18 LB, LT

1800

550

550

550

166

1350

2060

2600

42

3-phase

1500

HT 276/18 LB, LT

1800

1000

500

550

276

1800

2100

2600

45

3-phase

1850

HT 400/18 LB, LT

1800

1200

600

550

400

1900

2200

2680

69

3-phase

2600

HT 500/18 LB, LT

1800

1550

600

550

500

2100

2200

2680

69

3-phase

2700

HT 1000/18 LB, LT

1800

1000

1000

1000

1000

1800

2900

3450

140

3-phase

3000

HT 1030/18 LB, LT

1800

2200

600

780

1030

2950

2500

3050

160

3-phase

3200

1Depending on furnace design connected load might be higher *Please see page 77 for more information about supply voltage